While the secret service is in charge of the security detail, and they were securing the area inside the rally perimeter fence, they had also used local law enforcement personnel to secure the area outside the perimeter fence.
The rooftop in question was outside that fence, where the locals were supposed to be keeping things secure .
... So did you wake up this morning and just say to yourself "I need to defend some cops"
The secret service were in charge of trump's security detail. There was an armed gunman on a roof for a ridiculously large amount of time. No matter how many punisher skulls you have tattooed on your wee wee, they fucked up. Simple as that.
In your anger at everything with a badge you seem to have missed that I was blaming the local cops for not properly doing the job they had been assigned.
But hey, I guess I am just angry at badges and not at increasingly militarized orgs that have no problem violating people's rights (breaking up protesters and the like) but can't even do the fucking job they are allegedly shitting on civil rights to do.